Kanban for ActiveScaffold

An addon for ActiveScaffold to render a kanban board instead of normal list, using a model's column for the kanban columns.

Usage

Add :kanban to actions.

active_scaffold :model do |conf|
  conf.actions << :kanban

Kanban view is used when index action is loaded with view=kanban parameter. Default list view can be replaced with kanban with conf.kanban.replace_list_view = true.

Then define the column used as kanban columns in the board with conf.kanban.group_by_column. It works with both DB column and association. The columns for the board are returned with the kanban_columns helper, and it uses the same way to get the values as :select form_ui. The helper kanban_columns can be overrided, supporting model prefix, but the default helper supports the same methods to define or change the available values:

• for single columns, define with options[:options] in the column, or override active_scaffold_enum_options (supports model prefix)
• for associations, define options_for_association_conditions or association_klass_scoped, model prefix is supported too.

Dragging a card to other column will use update_column action, like inplace edit, to change the value. If update_column action fails to save, the card is reverted to the original position.

If no position column is defined in sortable, or sortable action is not added, the position on the column can't be changed (drop on the same column reverts to the original position), and the position on the new column is not respected (position may change when kanban is reloaded).

To define a position column, add :sortable to conf.actions, and define conf.sortable.column, then changing the position on the original column will use reorder action (as active_scaffold_sortable), and dragging to other column will use update_action and will pass the new order to update the order too.

A column may accept items, but don't allow to drag items out. Override kanban_column_receive_only? (supports model prefix too) which receives the column value (associated record if the column is an association) and return true for the columns which don't accept to move cards out.

Define the method used for the title with conf.kanban.title_method (defaults to :to_label), and method used for description with conf.kanban.description_method. The card is rendered with _kanban_card.html.erb view partial, which can be overrided to change the html structure of a card, and supports model prefix too. Also the kanban_description helper can be defined, which supports model prefix, to change only the body of the card. The actions are rendered calling the kanban_actions helper, which supports model prefix, or actions can be ignored in kanban by defining ignore_method? in the action_link to skip them if @kanban_view variable is set, or overriding skip_action_link? helper.

A javascript event kanban:beforeChange is fired on the card, when it's drop into other column, before sending the request to update the column. The event receives a object argument with 2 properties, the id of the card and the value of the new column (when column is an association, value is an id too). If the event listener returns false, it will reject the change, and the card will revert to the original position. The event listener can set extra params to send to the update_column action, with jQuery(event.target).data('params', {key: value}).